Bale loader

ABSTRACT

Bale loader, for use with a truck having a horizontal bed adapted to be tilted to vertical position for depositing its bale load on the ground, characterized by means for attaching the loader to the truck to be bodily carried thereby during use, means for picking up spaced bales lying on the ground as the truck moves along a field and conveying same to a bale assembly station disposed adjacent the rear end of the bed wherein a bale wall is assembled, and means for sequentially pushing the bale walls toward the front end of the bed until the entire length of the bed is filled with bale walls, after which the loader may be detached from the truck, whereby the truck may proceed to an unloading locus without being encumbered by the loader. Since all loading operation are preferably under automatic powered control, the entire loading operation is effected by only a truck driver by guiding the truck along a desired course in the field.

United States Patent 1 1 Primary Examiner--Robert J. Spar Attorney, Agent, or FirmSheridan, Ross & Fields Miskin May 7, 1974 BALE LOADER I [75] Inventor: Richard'B. Miskin,-Ucon, Idaho [57] ABSTRACT [73] Asslgnee: Miskin Scraper works Ucon Bale loader, for use with a truck having a horizontal Idaho 7 bed adapted to be tilted to vertical position for depos- [22] Filed; Man 10, 1972 iting its bale load on the ground, characterized by means for attaching the loader to the truck to be PP N05 233,430 bodily carried thereby during use, means for picking up spaced bales lying on the ground as the truck 52 U.S. Cl. 214/6 B, 214/508, 214/518 moves along a field and wnveying Same to a bale 511 rm. 01...; B65g 57/32 sembly Station disposed adjacent the rear end of the [58] 'Field of Search 214/518, 508, 519, 6 B, bed wherein a bale Wall is assembled, and means for 214/6 P, 6 H, 6 D 7 sequentially pushing the bale walls toward the front end of the bed until the entire length of the bed is [56] References Cited filled with bale walls, after which the loader may be UNITED STATES PATENTS detached from the truck, whereby the truck may proceed to an unloading locus without being encumbered g by the loader. Since all loading operation are prefera- 35Ol025 3/970 Jay et a] N u 214/6 B bly under automatic powered control, the entire load- 315961777 8/1971 Neely, Jr.I.::::..::::::..:.::....:::: 214/6 B mg operation effected by only a truck driver by guiding the truck along a desired course in the field.

16 Claims, 10 Drawing Figures SHEEI 1 BF 3 PATENTEU MAY 7 I974 PATENTEDIAY 7 m4 SHEET 3 BF 3 5 R L E H, S I l I I l ll- U P P w MM 8 I 9 RN 6 U MW mm. m W P A 5 s m 2 O 5 M W 2 H m L Q E B A C C 2 H N E. C P W L 7 Q M 6 E T S S S m w H 5 m R 6 3 P 9 i m S 2 HT D. M 9 m C Ill ENGINE POWER TAK E OFF PUM P 92,69 SINGLE ACTING RAMS 65, 53,85 DOUBLE ACTING RAMS BALE LOADER BACKGROUND OF TI-IEINVENTION In the haying art it is conventional practice to bale hay with a baler which moves along a harvested field and deposits the bales on the field at various loci. They are then loaded onto a truck, wagon or tractor drawn trailer for transportation to their storage locus or destination. It is also known practice to provide the trans-- portation vehicle with a normally horizontal bed pivoted to the vehicle adjacent its rear end which may be tilted to a substantially vertical position' to permit the bale load to be bodily removed therefrom, such as by a hydraulically operated pushing device carried by the vehicle, which pushes the vehicle away from the bale load, thus depositing the bale stack at the desired storage locus. In a refinement of the general procedure just referred to, it is also conventional practice to load the bales onto a truck which may carry its bale load to the unloading locus at highway speeds, this being particularly advantageous when the unloading locus is a considerable distance from the bales in the field as compared to transporting same with a horse drawn wagon, a tractor drawn trailer, or other slow moving vehicle which is not adapted for high speed transportation over highways. A tiltable bed of the type referred to is exemplified by the "Stackmaster manufactured by Miskin Scraper Works, Inc. of Ucon, Idaho, which may be attached to conventional trucks, manufactured by others.

Since such truck and its bed is not encumbered with any bale loading apparatus carried thereby it may be employed for transportation or dumping of other farm loads by suitable selection of bed stakes, bed side boards, etc. I

A field bale loader is optionally supplied for such a truck when bale hauling is part of the overall hauling functions of the truck, also manufactured by the Miskin firm referred to. This comprises, briefly a wheel supported device, removably affixed to the truck adjacent one side thereof which is moved along the field with the truck and-having an elevator which picks up the bales and elevates-same to a receiving platform at one side of the truck bed which may be adjusted to variable elevations above the truck bed. The bales are then manually removed from the platform and stacked on the bed in desired patterns, preferably interlocking patterns. When the bed is loaded, the loader is detached and the truck proceeds to its destination. If such destination is a considerable distance from the hay field it will be apparent that the loader may be attached to other trucks for loading same during the interim for return of the first truck, thus reducing idle or down time of the loader as compared, for example, with a loader which forms a part of a single purpose vehicle and must be transported therewith, to and from the unloading locus.

SUMMARY OF THE INVENTION The present invention is characterized by the Miskin combination of a tiltable bed truck and a detachable bale loader for same as previously described but differs in various respects. For example: the manual transfer and handling of the bales from the table is eliminated and the entire loading of the bales is attained by only the truck driver by driving the truck'along the field in a desired course to pickup the bales lying thereon, the

movement of the bales to their positions of repose on the bed thereafter being automatic; the bales are delivered to an assembly station just ahead of the rear end of the bed wherein astacked wall of bales is formed after which the wall is pushed forwardly on the bed at least one bale wall thickness to thus re-establish another empty assembly station; this continues until the length of the truck bed is loaded with bale walls. Preferably, the bed is disposed in inclined position with the walls leaning rearwardly which renders same more stable against falling forwardly, as compared to vertically extending walls; since they are unstable against falling rearwardly, however, and may tend to slide rearwardly in some instances, the rearmost wall is clamped to the bed except when a new wall (and walls previously formed) are pushed forwardly during which time a wall pusher stabilizes the load from falling or sliding rearwardly; a tiltable bale support table is provided adjacent the upper end of the bale assembly station to which one or a plurality of bales may be optionally delivered for dumping into the upper end of the assembly station for forming walls of difierent bale arrangements disposed on an incrementally lowering platform, such as a tie wall; depositing certain of the bales on their ends by unbalanced gravity force utilizing other bales as fulcrums; and, providing the loader with a hydraulically operated swingable leg and cable system for attaching and detaching the loader to and from the truck.

r The foregoing features comprise the principal objects of the invention. Further objects, advantages and salient features will become more apparent from the detailed description to follow, the appended claims and the accompanying drawings, to now be briefly described.

BRIEF DESCRIPTION OF DRAWING FIG. 4 is a diagrammatic side elevation as viewed from line 4--4, FIG. 3, the truck bed being illustrated in horizontal position to simplify the drawing, rather than in the normal inclined loading position of FIG. 1;

FIG. 5 is a detail of a bale wall clamp;

FIGS. 6, 7 and 8 illustrate the steps in assembling a tie wall;

FIG. 9 is a side elevation of the loader leg illustrating the manner of attaching the loader to a truck;

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT GENERAL Referring now to the drawing, and first to FIGS. 1-4 and 10, the subject of the invention comprises: a rigid frame 20 to which is affixed an elevator 22 disposed adjacent one side of a truck 24-having a tiltable bed 26;

a tiltable cross table 28 to which bales are delivered from the side elevator; a lowering platform 30 forming a floor for a bale wall assembly station 32; a bale wall pusher 34; and a movable bale .wall hold down member or clamp 36. As will be understood, the bed 26, as illustrated in FIG. 4, willnormally be disposed in the inclined position of FIG. 1 during loading of bales thereon. Suitable means are also provided, to be subsequently' described in detail, for attaching the bale loader to the truck and for detaching same therefrom after thetruck has been fully loaded.

SIDE ELEVATOR Side elevator 22 comprises a frame a forming a rigid part of the loader frame, the lower end of which is provided with rearwardly convergent sideplates 38, for guiding a bale onto a conveyor chain 40. The plates and chain are supported on a horizontal pivot 42 to permit same to float upwardly when ground irregularturning shield 54 which turns the bale 90 for transfer to cross table 28. Suitable spaced tines not shown) are provided on all chains which disengage from the bale during transfer of a bale from one chain to another.

CROSS TABLE Cross table 28 comprises a flat floor 56 and upstanding plate 58 which prevents a bale disposed thereon from sliding 'forwardly when the floor is disposed in forwardly and downwardly inclined position. The table is pivoted about a horizontal axis 60 so that it may be moved to a rearwardly and downwardly inclined position at which bales thereon slide off of same and fall into the upper end of the assembly station 32.

A cross conveyor chain 62, driven by conveyor chain 50 through a gear transmission 64, is provided with an upper run disposed adjacent the floor of the table, with its tines projecting above the table, this chain being movable around sprockets journaled about axes fixed with respect to the loader frame. As will be apparent, when the table tilts, a bale disposed thereon is first lifted away from the tines, after which it is free to slide on the table and fall into the upper end of the assembly station.

As best shown in FIG. 3 conveyor chain 62 terminates somewhat short of the center line of the truck bed so that a bale may be delivered to the distal side of the table where it may rest free of the tines. This permits a second bale to be moved to a position relative to the chain where the second bale is disposedin a symmetrical position at the proximate side of the bed centerline. When in such position, motion of chain 62 is discontinued after which the table is tilted to dump both bales into the upper end of the assembly station.

Tilting of the table is effected by a double acting ram 65 FIG. 10) the valve 67 for which is under control of bale position abutments 66 and 68. Abutment 66 may remain in a desired fixed position and abutment 68 may be selectively moved into orout of the path of a bale. When abutment 66, only, is employed a first bale will be conveyed beyond the inner end of chain 62 and rest on the table. The next bale being conveyed by chain 62 moves until it abuts the first bale and slight further movement causes the first bale to engage abutment 66 and decluth clutch 52, arresting motion of chains 50, 62. In response to the arresting of motion of chain 62, the table actuating ram 65 is commanded to tilt and deposit both bales into the upper end of the assembly station. When abutment 68 is moved to a position where it is in the path of a bale, the operation of the clutch and tilt of the table is the same except that only one bale will be deposited into the assembly station, this being deposited centrally into same.

LOWERING PLATFORM The lowering platform 30 comprises a floor 70 secured to floor supports 72 disposed at opposite ends of the fl'oor and guided for rectilinear movement along upstanding posts 74, such as channel sections, rollers 76 preferably being carried by the floor supports to minimize friction which would otherwise be considerable since the floor is cantilevered from the guide posts. The platform may be lowered and raised in any desired manner. As illustrated, it may be lowered by its own weight and load thereon and thus requires power only for raising same fromits lowermost position to its uppermost position. To attain this, the lower end of a cable 78 is affixed to each floor support which is trained around an idler pulley 80 disposed at the upper end of each post. The two cables are thence trained over suitable other idler pulleys to a winch mechanism not shown) the motion of which is controlled by a hydraulic cylinder 69 FIG. 10) and a control valve 71 for same which allows predetermined incremental move ment of the ram to thereby cause the winch to allow the table lowering elevator to lower in increments equal to the thickness of a bale. When the floor of the platform reaches the truck bed after the bale wall has been assembled, it is pushed off of the elevator by the pusher, to now be described, and the elevator is returned to its uppermost position to thus receive bales which will form the succeeding bale wall.

BALE WALL PUSI-IER The bale wall pusher comprises a plurality of transversely spaced plates 82 rigidly connected together and disposed in a common plane for engaging the rear plane of the bale-wall. A plurality of plates are employed, rather than a single plate, since the rear vertical truck b'ed stakes are left in place andthe plates of the pusher must move therebetween, As illustrated, the pusher is connected to the baler frame by pairs of links 84, the upper ends .of which are pivotally connected to the baler frame and the lower ends of which are pivotally connected to the pusher, thus forming a parallelogram linkage which constrains the pusher plates to remain parallel in all positions thereof. In .an operative embodiment, three sets of links are provided, one set being at the center of the pusher and the other two sets at opposite sides of the center set, thus providing a linkage system which supports the pusher plates for movement as described. A double acting -hydraulic ram 85 (FIG. 10) is connected between the pusher and loader frame, preferably at a locus centrally of the pusher, for moving the pusher between its rearward and forward limits of movement and under control of valve 87.

HOLD DOWN CLAMP Clamp 36, as illustrated in FIG. 5, is formed as a plate having a lip 86 at its rear edge for engaging the upper rear edge of the bale wall. Links 88 disposed at opposite lateral ends of the plate and pivotally connected thereto and to frame support the plate for swinging movement to and from the bale wall. A spring 90 at each end urges the plate downwardly and hydraulic rams 92, disposed at each end, raise the plate away from the top of the bale wall to free same for forward slidable movement on the truck bed, the ram bein under control of a valve 93.

SUMMARY OF SEQUENCE OF OPERATION It will be assumed that: the truck is in constant motion across a field, conveyor chains 40, 46, 50, 62 are in constant motion; bales are being periodically picked up by the side conveyor and delivered to the cross table; and conventional bale walls are formed of two adjacent stacks of vertically aligned bales. The sequence is as follows:

1. Pick up first bale and convey to distal side of cross table.

2. Pick up second bale and convey to proximate side of cross table.

3. Discontinue operation of cross conveyor declutch 52).

4. Tilt cross table dump bales), return to original position and resume operation of cross conveyor.

5. Lower lowering platform one bale thickness during return of cross table.

6. Repeat operations until bale wall is completed and lower platform to truck bed.

7. Operate pusher to forward position, moving bale wall off of lowering platform.

8. Move bale wall clamp to clamping position.

9. Return pusher to rearward position and raise low ering platform to uppermost position.

10. Repeat operations until desired number of untied walls are disposed on truck bed, retaining bale wall clamp in clamped position except when a wall thereunder is being pushed forwardly.

TIE WALL (FIGS. 6, 7 AND 8) When it is desired to form a tie wall between conventional walls, as just described, the operation is modified as follows:

1. Move bale abutment 68 into path of bale on cross table which stops a bale at a position centrally thereof.

, formed in reverse order in which event the tie wall would appear as viewed from a position 180 from that of FIG. 8.

LOADER TO TRUCK CONNECTIONS (FIGS. 1,2

- AND 9) When not in use, the loader is supported on a field by a three point support system. The support for the major portion of the weight of the loader comprises a pair of laterally spaced feet 94 disposed at the lower end of a leg 96,"pivoted at its upper end to the rear end of the loader for swinging movement about a horizontal axis. The third support comprises a segmental wheel 98 carried by the side elevator, the arcuate portion of which may roll along the field. A pair of slack cables 100, one at each side of the loader are provided, each having one end connected to the leg and the other end connected to a plate 102 having an aperture 104 adapted to engage an upstanding pin 106 on the rear end of the truck bed. A doubleacting hydraulic ram 108 is connected between the loader frame and leg for swinging the latter in opposite directions. In the operation of the mechanism, the truck is backed into appropriate position adjacent the loader as shown in FIG. 1 and the two plates 102 are secured to pins 106. With the brakes set on the truck, the leg is swung rearwardly by the ram, taking up slack in the two cables. As the loader lowers and moves toward the truck a roller 1 10 at each side of the loader contacts a plate and the roller rolls along same transferring a part of the loader to the truck. As the cables approach alignment with the leg, a pair of laterally spaced abutments on the loader engage the rear end of the truck bed and another abutment 1 12 disposed centrally between and beneath the other two abutments engages another abutment 114 on the truck thereby providing a three point abutment system between the loader and the truck. When the cables are finally tensioned they toggle across the line of pull. The weight of the rear end of the loader has now been transferred to the truck through the two rollers and the tension in the cables has now drawn the three abutments referred to in tight engagement, thus preventing relative movement between the truck and loader.

A third slack cable 116 is also secured to the leg which is trained over idler pulleys not shown) carried by the side elevator, its forward end being provided with a hook 118 detachably engageable with a laterally extensible cantilevered bar 120 secured to the truck frame. During the tightening of the first two cables and movement of the loader toward the truck the side elevator moves forwardly as segmental wheel 98 rolls along the field. During final tensioning of the third cable the front end of the side elevator is lifted, transferring weight on the segmental wheel to bar 120. When tensioning of the third cable is completed notched abutments 122 on'the side elevator abut and lock to bar 120, thus forming another rigid connection between the truck and loader. Segmental wheel 98 may now be swung to a position where it will clear irregularities in the field.

As will be apparent, when the leg is swung down.- -wardly to its original position it and the segmental wheel may again-support the loader on the field and permit the cables to be disconnected from the truck.

' CONTROLS AND SUMMARY (FIG. 10

In an operative embodiment of the invention, a pump carried by the truck, driven by a power take-off from the truck engine, which pump is normally employed to tilt the truck bed and operate a bale load pusher when the bed is tilted to vertical position, is employed as the source of power for operating the various instrumentalities carried by the loader. Motion of the various parts is thus effected by hydraulic motors carried by the loader which are controlled by valves. In the most simple form of the invention these valves could be disposed in the truck cab and sequentially operated by the truck driver, observing the loading operation through a mirror system. This would be. cumbersome, however, since it would detractfrom the attention which should be concentrated on steering the truck. This could be obviated by disposing the valves on the loader and providing an operator for same. One of the concepts of the invention, however, is to eliminate all manual intervention in the loading operation, other than guiding the .truck across a field. The sequence of operation of the instrumentalities is thus preferably automatic.

In the operative embodiment of the invention referred to, motion of the various parts is sensed and the signalsare conveyed to valves which, in turn, command hydraulic motors to operate in proper sequence.'Links, cams, index mechanisms, etc., all mechanically operated by motion of the parts, are employed in the sensing. Since these mechanisms are quite complicated, illustration thereof has been omitted in the interests of simplifying the drawing. Moreover, they could take various forms, depending upon the designer provided the end results were known. As an example, it is common practice to sense the position of moveable parts with photoelectric cells and amplify the signals to operate actuators, such as solenoids, etc. Thus, it is believed within the purview of those skilled in the art to devise control systems, other than that employed in the operative embodiment, which would perform'the same sequence functions so long as the desired sequence is known. The specific control system employed is thus believed to be no partof the invention, per se, and thus not germane to the overall combinations as set forth in the appended claims other than its broad office of providing sequence, programming means for thevarious moveable instrumentalities. 7

What is claimed is:

1. Apparatus for loading spaced bales of hay lying on a field onto the bed of a truck in stacked configuration as the truck continuously moves along the field, each stacked configuration forming a bale wall adapted to be disposed adjacent another bale wall, comprising:

a. a bale loader adapted to move with the truck in predetermined relation therewith;

b. an elevating conveyor carried by the loader disposedadjacent one side of the truck, the lower end of which is adapted to sequentially pick up individual bales lying on the field;

c. a bale'assembly station disposed forwardly adjacent the rear end of the bed;

(1. a lowering platform having a movable fioor for the assembly station adapted to be periodically and incrementally lowered;

e. a bale support table disposed'adjacent the upper end of the assembly station adapted to be tilted to transfer a bale or bales disposed thereon into the upper end of the assembly station and to be supported by the lowering platform;

f. transfer means for moving bales from the elevating conveyor onto the bale support table;

g. the construction being such that a bale wall of desired height may be formed in the assembly station when the lowering platform descends to a predetermined position;

h. a bale wall pusher disposed rearwardly of the assembly station adapted to move forwardly and bodily push a bale wall toward the front end of the bed a distance at least the thickness of the bale wall to thereby provide an empty space behind same in which a next wall may be assembled;

i. the construction being such that the bale walls are periodically pushed toward the front end of the bed until a desired load of bale walls is formed thereon.

, 2. Apparatus in accordance with claim 1, including means for retaining the bed at an inclined plane at which the rearmost bale wall leans and tends to fall rearwardly but is stable against-falling forwardly, and means for preventing said rearmost bale wall from falling or sliding rearwardly.

3. Apparatus in accordance with claim 2 wherein the preventing means comprises a releasable clamp engageable with the rearmost. wall for applying a compressive force between its upper and lower ends.

4. Apparatus in accordance with claim 1 including means for automatically. operating the table, lowering and raising of the platform, and the movement of the bale wall'pusher in desired sequence.

5. Apparatus in accordance with claim 1 including hydraulic motors for operating the conveyors, the table, the platform, and the bale pusher, and a hydraulic pump for periodically circulating liquid to and from the motors.

6. Apparatus in accordancewith claim 1 including a pair of downwardly extending legs pivotedat their upper ends to the bale loader adjacent its rear endand adapted to be swung upwardly and rearwardly, a forward portion of said first conveyor forming a third supportfor the loader, a pair of slack cables or the like,

each secured at one end thereof to a leg, their other ends each being secured to apertured plates each adapted to releasably-engage a pin on the truck, a third slack cable or the like secured at one end to one of the legs, itsother end adapted to be releasably connected to a laterally extending cantilevered bar carried by the truck, and a double acting hydraulic ram for swinging the legs in both directions, the construction being such that when the legs swing rearwardly, slack in the cables is first taken up, after which abutments on the loader lower onto the plates, forming atwo point load support for same, the third cable lifting the first conveyor, forming a third point load support for the loader, and

abutments on the truck and on the loader adapted to come into abutting relationship when the cables approach their final tensioned conditions.

7. Apparatus in accordance with claim 6 including a field engaging wheel adapted to support the front end of the first conveyor when the loader is not in use, said wheel adapted to roll on the field during attachment of said front end to said bar, after which it may be moved to a position to prevent it from engaging the field.

8. Apparatus in accordance with claim 1 wherein the lower end of the elevating conveyor is provided with a pair of rearwardly convergent bale entry plates adapted to guide a bale between same, said plates being pivotally adjustable to various positions above the field for clearing same and adapted to pivotally float upwardly when they engage irregularities in the field.

9. Apparatus in accordance with claim 1 including a hydraulic motor for operating the elevating conveyor, a clutch disposed between same and the transfer means adapted to discontinue operation thereof when declutched, and means responsive to the movement of a bale or bales disposed on the table for disconnecting the clutch to prevent movement of a bale to the table during its tilting movement.

10. Apparatus in accordance with claim 1 wherein the bales may be deposited in the assembly station to form a wall of two adjacent like tiers with the bale sides in abutting relationship, or deposited into the assembly station with some of the bales disposed in a single tier disposed centrally of the bed, others disposed on their ends at each side thereof, and other bridging the central tier and the bales disposed on their ends to thereby form a tie wall.

11. Apparatus in accordance with claim 10 wherein the bales disposed on their ends are deposited in their positions by falling on upper opposite edges of the central tier and rotate 90 as they fall into position.

12. Apparatus in accordance with claim 1 wherein said transfer means comprises an endless conveyor chain disposed adjacent the bale support table, one end of which terminates adjacent its central portion.

13. Apparatus in accordance with claim 2 wherein the bed is pivotally connected to the truck for movement between a horizontal hauling position and a substantially vertical unloading position, and means for moving the bed between said positions.

14. Apparatus in accordance with claim 3 wherein said clamp is disposed above the top of the rearmost wall and adapted to force same downwardly against the bed.

15. Apparatus in accordance with claim 5 wherein said hydraulic pump is operated by the truck engine, and means for disconnecting communication between the pump and motors when the loader is disconnected from the truck.

16. Apparatus in accordance with claim 1 wherein the loader is adapted to rest on the field when not in use, and means for rigidly connecting the loader to the truck, whereby it may be carried thereby during use. 

1. Apparatus for loading spaced bales of hay lying on a field onto the bed of a truck in stacked configuration as the truck continuously moves along the field, each stacked configuration forming a bale wall adapted to be disposed adjacent another bale wall, comprising: a. a bale loader adapted to move with the truck in predetermined relation therewith; b. an elevating conveyor carried by the loader disposed adjacent one side of the truck, the lower end of which is adapted to sequentially pick up individual bales lying on the field; c. a bale assembly station disposed forwardly adjacent the rear end of the bed; d. a lowering platform having a movable floor for the assembly station adapted to be periodically and incrementally lowered; e. a bale support table disposed adjacent the upper end of the assembly station adapted to be tilted to transfer a bale or bales disposed thereon into the upper end of the assembly station and to be suPported by the lowering platform; f. transfer means for moving bales from the elevating conveyor onto the bale support table; g. the construction being such that a bale wall of desired height may be formed in the assembly station when the lowering platform descends to a predetermined position; h. a bale wall pusher disposed rearwardly of the assembly station adapted to move forwardly and bodily push a bale wall toward the front end of the bed a distance at least the thickness of the bale wall to thereby provide an empty space behind same in which a next wall may be assembled; i. the construction being such that the bale walls are periodically pushed toward the front end of the bed until a desired load of bale walls is formed thereon.
 2. Apparatus in accordance with claim 1, including means for retaining the bed at an inclined plane at which the rearmost bale wall leans and tends to fall rearwardly but is stable against falling forwardly, and means for preventing said rearmost bale wall from falling or sliding rearwardly.
 3. Apparatus in accordance with claim 2 wherein the preventing means comprises a releasable clamp engageable with the rearmost wall for applying a compressive force between its upper and lower ends.
 4. Apparatus in accordance with claim 1 including means for automatically operating the table, lowering and raising of the platform, and the movement of the bale wall pusher in desired sequence.
 5. Apparatus in accordance with claim 1 including hydraulic motors for operating the conveyors, the table, the platform, and the bale pusher, and a hydraulic pump for periodically circulating liquid to and from the motors.
 6. Apparatus in accordance with claim 1 including a pair of downwardly extending legs pivoted at their upper ends to the bale loader adjacent its rear end and adapted to be swung upwardly and rearwardly, a forward portion of said first conveyor forming a third support for the loader, a pair of slack cables or the like, each secured at one end thereof to a leg, their other ends each being secured to apertured plates each adapted to releasably engage a pin on the truck, a third slack cable or the like secured at one end to one of the legs, its other end adapted to be releasably connected to a laterally extending cantilevered bar carried by the truck, and a double acting hydraulic ram for swinging the legs in both directions, the construction being such that when the legs swing rearwardly, slack in the cables is first taken up, after which abutments on the loader lower onto the plates, forming a two point load support for same, the third cable lifting the first conveyor, forming a third point load support for the loader, and abutments on the truck and on the loader adapted to come into abutting relationship when the cables approach their final tensioned conditions.
 7. Apparatus in accordance with claim 6 including a field engaging wheel adapted to support the front end of the first conveyor when the loader is not in use, said wheel adapted to roll on the field during attachment of said front end to said bar, after which it may be moved to a position to prevent it from engaging the field.
 8. Apparatus in accordance with claim 1 wherein the lower end of the elevating conveyor is provided with a pair of rearwardly convergent bale entry plates adapted to guide a bale between same, said plates being pivotally adjustable to various positions above the field for clearing same and adapted to pivotally float upwardly when they engage irregularities in the field.
 9. Apparatus in accordance with claim 1 including a hydraulic motor for operating the elevating conveyor, a clutch disposed between same and the transfer means adapted to discontinue operation thereof when declutched, and means responsive to the movement of a bale or bales disposed on the table for disconnecting the clutch to prevent movement of a bale to the table during its tilting movement.
 10. Apparatus in accordance with claim 1 wherein the bales may be dePosited in the assembly station to form a wall of two adjacent like tiers with the bale sides in abutting relationship, or deposited into the assembly station with some of the bales disposed in a single tier disposed centrally of the bed, others disposed on their ends at each side thereof, and other bridging the central tier and the bales disposed on their ends to thereby form a tie wall.
 11. Apparatus in accordance with claim 10 wherein the bales disposed on their ends are deposited in their positions by falling on upper opposite edges of the central tier and rotate 90* as they fall into position.
 12. Apparatus in accordance with claim 1 wherein said transfer means comprises an endless conveyor chain disposed adjacent the bale support table, one end of which terminates adjacent its central portion.
 13. Apparatus in accordance with claim 2 wherein the bed is pivotally connected to the truck for movement between a horizontal hauling position and a substantially vertical unloading position, and means for moving the bed between said positions.
 14. Apparatus in accordance with claim 3 wherein said clamp is disposed above the top of the rearmost wall and adapted to force same downwardly against the bed.
 15. Apparatus in accordance with claim 5 wherein said hydraulic pump is operated by the truck engine, and means for disconnecting communication between the pump and motors when the loader is disconnected from the truck.
 16. Apparatus in accordance with claim 1 wherein the loader is adapted to rest on the field when not in use, and means for rigidly connecting the loader to the truck, whereby it may be carried thereby during use. 